If they are freshly cut, I wouldn't use them. Or, at least, test them first for tanins. I loaded my new pond with them about 10 years go with freshly pushed oaks for structure. The water turned black and was lethal for fish. I killed everything I stocked. I finally had to pump it dry and let the summer sun dry the bottom.
To test them: Cut a fresh piece and put it in a bucket of the pond water. If it turns black, let them dry until all of the tanins have leached out.
It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.
Without a sense of urgency, Nothing ever gets done.
Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP Grandpa
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